The average scalp has about 100,000 hair follicles at its maximum in the early 20's. Each follicle can grow about 20 individual hairs in a person's lifetime Average hair loss is about 50-150 hairs per day.Incidence of pattern baldness varies based on genetic background. Environmental factors other than diet do not seem to affect this type of baldness greatly. Male pattern baldness is often characterized by hair receding from the lateral sides of the foreskin , known as "receding hairline" An additional bald patch may develop on the crown. Androgens or male sex hormones such as DHT, or dihydrotestosterone initiate this variety of hair loss, also known as androgenetic alopecia. DHT also influences the growth and action of the prostate. DHT sets off a process of follicular miniaturization. In follicular miniaturization, hair shaft length and diameter progressibely decrease. In the long term, this produces vellus hair or "peach fuzz". Eventually, the follicle can scar down ("fibrose") and hair may disappear completely. Genetics: both parents contribute to their offspring's likelihood of hair loss. Most likely, inheritance is technically "autosomal dominant with mixed penetrance"
There is no consensus regarding the details of the evolution of male pattern hair loss. Most theories regard it as resulting from sexual selection. A number of other primate species also experience hair loss following puberty, and some primate species clearly use an enlarged forehead, created both anatomically and through strategies such as frontal balding, to convey increased status and maturity. The assertion that MPB is intended to convey a social message is supported by the fact that the distribution of androgen receptors in the scalp differs between men and women, and older women or women with high androgen levels often exhibit diffuse thinning of hair as opposed to male pattern baldness.
One theory, suggests that male pattern hair loss evolved through sexual selection as an enhanced signal of aging and social maturity, whereby aggression and risk-taking decrease and nurturing behaviours increase. This may have conveyed a male with enhanced social status but reduced physical threat, which could enhance ability to secure reproductive partners and raise offspring to adulthood.
Above link goes to gohair.com. In one study , males and females viewed 6 male models with different levels of cranial hair (full head of hair, receding and bald). Participants rated each combination on 32 adjectives regrowth hairloss treatment related to social perceptions. Males with facial hair and those with bald or receding hair were rated as being older than those who were clean-shaven or had a full head of hair. Beards and a full head of hair were seen as being more aggressive and less socially mature, and baldness was associated with more social maturity.
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